High-pressure fluid control valve



July 21, 1953 N. BEDINI 2,646,245

HIGH-PRESSURE FLUID coNTRoL VALVE Filed Dec. 8, 1947 t INVE/vog. Nenno Bedlm w, WV-2:24.

Hornevs.

Patented July 21, 1953 HIGH-PRESSURE FLUID CONTROL VALVE :Nerino Bedin, Milan, Italy, assignor to PirelliVV Societa per Azioni, Milan, Italy Y Application December 8, 1947, Serial No. 7909284 In Italy October 1K8, 1945 y section 1, Public Law 69o, August s, 194s Patent expires October 18, 1965" This invention relates to nigh pressure fluid control valves. It pertains moreparticularly to valvesv of this kind wherein a flexible diaphragm isemployed to sealthe extraneous outlets froln the valve chamber, :particularly around the movable elements of the valve, to insure against the `leakage of uid under' high pressure through the valve.

Heretofore, in valves Of this type two difficulties have commonly beeny encountered. First, the deformations of the flexible member incident to the movements of the movable elements of the valve have tended to cause permanent deformaltion of the flexible member, and secondly, re-

peated flexings of the diaphragm'member with the movements of the' movable elements of the Vvalve have caused a shearing through of said eolaims. (01251--31I valve head I which is adapted to reciprocate veris firmly clampedagainst its seat on Vthe shoulder flexible diaphragmralong its seatingline. Y yBoth of these difliculties result in leakage ofl fluid through the valveff Y n ,l i

An object of this invenl on isfto deviseahigh pressure'fluid control valve of thev flexible diaphragm type wherein the said diaphragm is of such novel shape and construction as to prevent permanent deformation from repeated operation l lofthe valve.

Y. Another Object of lthis invention is .tor devise a high pressure fluid control valve of the diaphragm type whereinv means are provided to prevent shearing failure of the diaphragm fromrrepeated opening and closing of the valve. p n f Still another object of this invention is' to provide a high vpressure liuid control valve of simple,

I compact and rugged construction which "can be readily assembled and` disassembled and which will have a much longer useful life than Vvalves of this type heretofore available. y

Y `With these and other objects in view which mayV 'be incident to this improvement,y thisl invention consistsof the combination Vand arrangement 'of elements hereinafter described and illustrated in the accompanying drawing whichshows thevprefrr'ed embodiment of the improved vvalve in rcenv sionrof fluid under high pressureto 'the valve. The chamber 2 is also in communication with an outlet passageway 5 in a branch 6 extending from the side of body I, for thev discharge Of fluid from the valve.

" The inlet orifice 3 ls controlled by a dise-shaped tically in the valve chamber 2 and has interposed between its lower face and the bottom of said chamber a coiled compression spring 8. .This spring 8 is alwaysunder compression and moves the valve head l away from the orifice 3 whenever the actuating `mechanismv of the valve is moved toopen the valve."

The upper end of the valve :chamber 2 isf-nlarged in diameter to form ashoulder 9, provided with an annular groove Ill, on which is seated an annular flange II of an elastically vflexible diaphragm member I2 which is centrally disposed in the valve chamber 2 :above and in abutting contact with valve head 1. l

The annular portion'II of the diaphragm I2 9 by an .annular disc member I3 whose width is equal tothe full width ofthe upper face of the flange portionl I I,. The disc .I3 is formed on its underside withan annular rib I4which registers with theannular groove I 0 so that when the flange II isj clamped to its seat by the disc I3,

the rubber (or otherliexible material) of the flange isy forced into the groove IU, thus vinsuring a perfect grip of the flange II on its seat and a fluid-tight seal'between the contacting parts. n Extending 'into and completely filling the cupshaped portion 'of the diaphragm I2 is a cylindrical plug I5 having a stem I6 depending from its bottom face and extending through a central hole I1 in the basev portion of the diaphragm I2 and of a diameter equal tov that of the hole. The upper face of the plug I5 has a spherically crowned shape and is surmounted at 'its center by an upwardly projecting centering lug, I 8. A

The upper enlarged po'rtion'of the valve cham- Y bei-"2 is internally Athreaded for the reception of K lower end for the reception of the external threads valve stem ZIJ,I is a detachable hand wheel 24Vheld` the external threads of a bonnet member I9 which,V when screwed home, holds thepdisc I3 firmly against the flange I I, as clearly shown in the drawing. Y

Thev bonnet I9 is internally threaded near its of a valve stem 2.0 which' extends vertically up through a hole 2| in the mid-portion of the bonnet I9 and isheld in iiuid tight contact with the ,I

upper portion of said bonnet by aconventional gland nut 22 and packing 23. n

Surmounting the squared upper vend of the in locked relation with `the stem 20 by the lock nut 25. The lower endof the stem 20 iscentrally recessedto receive the stem of a cylindrical thrust bearing member 26 whose lowerface of con-'- 3 cave shape to exactly nt the ccnvexupper face of the plug i5 and is centered on said plug in axial alignment by the registration of the centering lug i8 with a recess in the center of the lower face of the member 26.

When the valve stem is rotated by manual operation of the hand wheel 2li, the thrust bearing 26, being slidingly tted into the recess in said stem 2t, does not turn with said stem, anyhow, if it rotates the upper faceVV of the plug l5 is held against rotation by therm grip of the flexible diaphragm l2. Consequently there is no tendency for torque to be transmitted to the plug I5 and the diaphragm i2 fromthe valve lstein 20.

The axial length of the hole vl1 is slightly greater than that of the stem i6 of ytheplug l5, and thus when the valve is closed the bottom portion of the diaphragm l2 is compressed'between the bottom of the plug I5'and the top of the valve head 1, until the stem I5 contacts the upper face of the valve head 1. When the steml contacts the valve head 1,'the downward thrust of the valve stem 20 is transmitted through the bearing 2S, the plug l5 and the stem i5 direct to the valve head 1, although the compression strain in the lower part of the flexible vdiaphragm l2 also transmits some of the thrust from Vthe plug l5 to the valve head 1. When the valve is in fully closed Vposition the lower end of the stem 'i5 is forced hard against the upper face of the valve head .1 so as to presssaid head rmly down onto its seat around the` orifice 3. At the same time, the base of the cup shaped portion of the diaphragm l2 is in a, state of deformed compression between the plug i5 and the valve head 1 with resultant forcing of the wall of the hole l1 into fluid tight sealing contact with the periphery of the stem I6. The external surface of the cup shaped portion of the diaphragm l2 'is slightly conicahas clearly shown in the drawing, so as to leave between it andthe Wall of the valve chamber 2 an annular clearance space 21.

. The dimensions of the various parts and the elastic compressibility of the diaphragm are such that when the valve is closed, the side wall of the cup shaped portion of the diaphragm i2 is neither in tension nor compression, and when the valve is open, the pressure ofthe fluid now occupying the valve chamber 2 and the space 21 combined with the upward thrust of the spring 8 is sufcient to compress the cup shaped portion of the nexible diaphragm l2 into intimate contact with the wall of the chamber and also, by reason of the reaction of that wall, into increased sealing contact with the periphery of the stem l of the plug l5.

The particular construction described and shown in the drawing lends itself to easy and speedy assembly and dismantling of the valve while the side walls of cup shaped portion of the flexible diaphragm l2, being free of tensile or compressive stress when the valve is closed (its generally prevailing position), the said diaphragm has a greatly increased useful life period before it has to be renewed. Also the reinforcement of the nange portion ll of the diaphragm l2 by the clamp disk I3 prevents the shearing of the flange i from the cup shaped portion of the 4 fied in combination and arrangement by those skilled in the art without departing from the spirit of my invention or exceeding the scope of the appended claims.

I claim:

l. A high pressure fluid control valve comprising a valve chamber having a shoulder and a fiuid inlet and a fluid outlet, a valve head for controlling the fluid ilow through said outlet, a cup shaped expansible diaphragm in said chamber separate from said valve head and adapted to Aseal said chamber against fluid leakage, said diaand prevents shearing of said diaphragm in the diaphragm i2 from repeated application of presy sure on said diaphragm.

While I have shown and described the preplane of said flange.

2. A high pressure fluid control valve comprising a valve body, a valve chamber within said body having a fluid inlet orifice and a fluid outlet orifice, a rigid valve head slidably mounted in said chamber and adapted to seat directly on said inlet orifice, means movable separately from said valve head for applying a thrust to said valve head lengthwise of its direction of slide, and an expansion diaphragm mounted within said chamber and having a portion xed with respect to said valve'body and said diaphragm encircling said means Vand adapted to be expanded thereby transversely of the movement of said means, whereby the space between said means and said diaphragm is sealed and leakage of fluid from said chamber around said means is prevented at such times when said inlet orifice is opened.

3. A high pressure control valve comprising a valve body, a valve chamber in said body and having a nuid inlet orifice and a fiuid outlet orifice, a valve head in said chamber adapted to seat on said inlet orifice, means within said chamber separately movable from said valve head yfor controlling the position of said valve head with respectto said inletorifice, and an expansible diaphragm mounted in said Achamber and having a portion fixed with respect to said valve body and said diaphragm being interposed between said valve head and said actuating -means and having a recess extending inwardly from one face and within which recess said actuating means is seated and is encircled by the walls of said recess, said actuating means being embraced with increasing pressure .by said diaphragm when the former moves toward said valve head.

4. A valve according to claim 3 wherein said chamber is provided with a shoulder and said diaphragm has an outwardly extending flange seating on said shoulder and clamped in fluid tight contact therewith by a rigid annular disc overlying said flange. Y

5. A valve according to claim 3 wherein the side wall of the recessed portion of said diaphragm is without stress when said valve head is in closed position.

6. A high pressure huid control valve comprising in combination: a body, a valve chamber in said body, having a uid inlet and a fluid outlet orifice, a rigid valve head reciprocally mounted in said chamber and adapted to seat directly upon and close one of said orifices when said valve head is `in closed position; a valve stem threadedly mounted in said body; a movable, rigid thrust member, separably interposed. between said valve stem and said valve headand adapted to transmit axial thrust directly from ly compressed between a portion of said thrust member and said valve head and also radially expanded, by the movement of said thrust member and the fluid pressure in said valve chamber,

`so as to increase the viuid sealing pressure of said diaphragm against said thrust member and valve head, whereby fluid leakage from said valve chamber is prevented.

7. A control valve according to claim 6, wherein said axial thrust member comprises a cylindrical plug wholly embraced within said diai phragm; said plug being adapted to compress a portion of said diaphragm between said plug and said valve head, when said valve head is moved towards its closed position.

ing a valve chamber having a fluid inlet and a uid outlet, a valve head, for controlling the flow through said uid inlet,rand a separate thrusttransmitting member in said chamber; rotatable means, extending into said chamber and separate yis moved toward open position.

from said valve head and thrust-transmitting kmember, for applying van axial thrust through said thrust-transmitting member to said valve head to move said valve head toward closed position; means for biasing said head toward open position; a radially expansible diaphragm wholly embracing said thrust-transmitting member with a huid-tight contact, .and means for increasing the pressure of said contact as said valve head NERINO BEDINI.

References cited in the me of this patent UNITED STATES PATENTS Number Name Date 113,503 Dinnen Apr. 11, 1871 174,551 McKenzie Mar. 7, 1876 517,550 Messinger Apr. 3, 1894 957,347 Kennedy May 10, 1910 978,288. Harkom Dec. 13, 1910 1,485,792 McKay Mar. 4, 1924' 1,495,761 Moussette May 17, 1924 1,853,156V Sobon Apr. 12, 1932 2,089,977 Marchant Aug. 17, 1937 2,277,395 Franck Mar. 24, 1942 FOREIGN PATENTS Number Country Date Switzerland of 1935 

